/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2000-2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package com.sun.org.apache.xerces.internal.util;

import com.sun.org.apache.xerces.internal.impl.xs.util.SimpleLocator;
import com.sun.org.apache.xerces.internal.jaxp.validation.WrappedSAXException;
import com.sun.org.apache.xerces.internal.xni.QName;
import com.sun.org.apache.xerces.internal.xni.XMLAttributes;
import com.sun.org.apache.xerces.internal.xni.XMLDocumentHandler;
import com.sun.org.apache.xerces.internal.xni.XMLLocator;
import com.sun.org.apache.xerces.internal.xni.XMLString;
import com.sun.org.apache.xerces.internal.xni.parser.XMLDocumentSource;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;

/**
 * Receves SAX {@link ContentHandler} events
 * and produces the equivalent {@link XMLDocumentHandler} events.
 *
 * @author Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 */
public class SAX2XNI implements ContentHandler, XMLDocumentSource {

  public SAX2XNI(XMLDocumentHandler core) {
    this.fCore = core;
  }

  private XMLDocumentHandler fCore;

  private final NamespaceSupport nsContext = new NamespaceSupport();
  private final SymbolTable symbolTable = new SymbolTable();


  public void setDocumentHandler(XMLDocumentHandler handler) {
    fCore = handler;
  }

  public XMLDocumentHandler getDocumentHandler() {
    return fCore;
  }


  //
  //
  // ContentHandler implementation
  //
  //
  public void startDocument() throws SAXException {
    try {
      nsContext.reset();

      XMLLocator xmlLocator;
      if (locator == null)
      // some SAX source doesn't provide a locator,
      // in which case we assume no line information is available
      // and use a dummy locator. With this, downstream components
      // can always assume that they will get a non-null Locator.
      {
        xmlLocator = new SimpleLocator(null, null, -1, -1);
      } else {
        xmlLocator = new LocatorWrapper(locator);
      }

      fCore.startDocument(
          xmlLocator,
          null,
          nsContext,
          null);
    } catch (WrappedSAXException e) {
      throw e.exception;
    }
  }

  public void endDocument() throws SAXException {
    try {
      fCore.endDocument(null);
    } catch (WrappedSAXException e) {
      throw e.exception;
    }
  }

  public void startElement(String uri, String local, String qname, Attributes att)
      throws SAXException {
    try {
      fCore.startElement(createQName(uri, local, qname), createAttributes(att), null);
    } catch (WrappedSAXException e) {
      throw e.exception;
    }
  }

  public void endElement(String uri, String local, String qname) throws SAXException {
    try {
      fCore.endElement(createQName(uri, local, qname), null);
    } catch (WrappedSAXException e) {
      throw e.exception;
    }
  }

  public void characters(char[] buf, int offset, int len) throws SAXException {
    try {
      fCore.characters(new XMLString(buf, offset, len), null);
    } catch (WrappedSAXException e) {
      throw e.exception;
    }
  }

  public void ignorableWhitespace(char[] buf, int offset, int len) throws SAXException {
    try {
      fCore.ignorableWhitespace(new XMLString(buf, offset, len), null);
    } catch (WrappedSAXException e) {
      throw e.exception;
    }
  }

  public void startPrefixMapping(String prefix, String uri) {
    nsContext.pushContext();
    nsContext.declarePrefix(prefix, uri);
  }

  public void endPrefixMapping(String prefix) {
    nsContext.popContext();
  }

  public void processingInstruction(String target, String data) throws SAXException {
    try {
      fCore.processingInstruction(
          symbolize(target), createXMLString(data), null);
    } catch (WrappedSAXException e) {
      throw e.exception;
    }
  }

  public void skippedEntity(String name) {
  }

  private Locator locator;

  public void setDocumentLocator(Locator _loc) {
    this.locator = _loc;
  }

  /**
   * Creates a QName object.
   */
  private QName createQName(String uri, String local, String raw) {

    int idx = raw.indexOf(':');

    if (local.length() == 0) {
      // if naemspace processing is turned off, local could be "".
      // in that case, treat everything to be in the no namespace.
      uri = "";
      if (idx < 0) {
        local = raw;
      } else {
        local = raw.substring(idx + 1);
      }
    }

    String prefix;
    if (idx < 0) {
      prefix = null;
    } else {
      prefix = raw.substring(0, idx);
    }

    if (uri != null && uri.length() == 0) {
      uri = null; // XNI uses null whereas SAX uses the empty string
    }

    return new QName(symbolize(prefix), symbolize(local), symbolize(raw), symbolize(uri));
  }

  /**
   * Symbolizes the specified string.
   */
  private String symbolize(String s) {
    if (s == null) {
      return null;
    } else {
      return symbolTable.addSymbol(s);
    }
  }

  private XMLString createXMLString(String str) {
    // with my patch
    // return new XMLString(str);

    // for now
    return new XMLString(str.toCharArray(), 0, str.length());
  }


  /**
   * only one instance of XMLAttributes is used.
   */
  private final XMLAttributes xa = new XMLAttributesImpl();

  /**
   * Creates an XMLAttributes object.
   */
  private XMLAttributes createAttributes(Attributes att) {
    xa.removeAllAttributes();
    int len = att.getLength();
    for (int i = 0; i < len; i++) {
      xa.addAttribute(
          createQName(att.getURI(i), att.getLocalName(i), att.getQName(i)),
          att.getType(i),
          att.getValue(i));
    }
    return xa;
  }
}
